Nortel Enterprise 1000 Reference Manual page 80

Page 80 of 236 Analog Trunk Cards - NT8D14 Universal Trunk Card
Figure 31
RAN control signals (Control GRD = IDLE)
Succession CSE 1000
Media Gateway
NT8D14
Universal Slot 1
Trunk Card
0T
0R
Unit 0
0CP
0MB
Unit 1
Unit 7
Note 1: For continuous operation mode, connect the trunk unit MB line to the announcer B line
only and ground the announcer ST+ line. For pulse start or level start modes, connect the trunk
unit MB line to the announcer ST+ line only and leave the announcer B line unconnected.
Note 2: A maximum of 24 universal trunk card units can be paralleled to a single announcer
channel.
553-3023-211 Standard 1.00 June 2001
RAN modes of operation
Figure 31 shows the relationship of control signals to message playback for
the operating modes available in announcement machines. The signal names
shown in the figure are typical.
Module
I/O Panel
Connector
A
(W-BL)
26
(BL-W)
1
(W-O)
27
(O-W)
2
Part of
25-pair
cable
Parallel
trunk
connection
(Note 2)
Cross connect
MDF
Audio
pair
Signal
pair
Part of
25-pair
cable
Note 1
Typical customer-
provided external
equipment
Announcer
T
Ref
R
C
Com
MC
NC
B
Com
MB
NC
ST+
Opto-
isolator
STÐ
48 V
Tel
ground
553-CSE6255
Voice
signal
Control
relay
Busy
relay
Start